T 
OXYSTELMA. 65 
and the central opaque portion is occupied by a cellular 
roundish mass which has the same direction as the nucleus, 
to the base, of whose cavity it is attached. This is the com- 
mencement of the embryonary sac. 
The next stage when the coma was about 8 times longer 
than the ovule, presents no important change in the coat of 
the ovule, the embryonary sac is increased in size, and is 
now free from adhesion except by its apex to the apex of the 
cavity! This attachment is very slight, it contains towards 
its apex a globular semiopaque body, attached by a filament 
of similar appearance to the apex of the embryonary sac. 
The next stage presents the young seed much increased. 
The embryonary sac much enlarged. The embryo attached 
by the apex of its radicle, by a very short thread which 
does not reach the apex of the sac, and the cotyledons 
considerably developed and alternate with the raphe, the 
traces of the original adhesions of the sac are visible. 
The next presents the raphe completely developod, ter- 
minating towards the centre of the seed and towards the 
centre of the cotyledons. 
The embryonary sac occupies the chief portion of the 
seed, and it is occupied chiefly by the embryo which has as- 
sumed its mature form the cotyledons, being now nearly op- 
posite the raphe. 
Finally the sac becomes attenuated to a membrane, appear- 
ing to contain no albumen, the embryo fills its cavity almost 
entirely and the cotyledons become opposed to the raphe. 
The remarkable parts are in this, the incompleteness of 
the raphe, it has in common with some others as Veronica, 
the late appearance of the embryonary sac, its change of 
attachment, and the change in the situation of the cotyledons. 
Bud } line long, mass not separable from the cell, I see 
very little analogy between the formation of the pollen in 
epiadez and the ordinary forms, in the earliest stage seen 
* mass consist of an excessively fine sac, containing 
much molecular matter, either scattered or aggregated in 
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